Transmission gear for changing rotating movements into reciprocating movements



June 24, 1941. G. KIEFER 2,246,733

TRANSMISSION GEAR FOR CHANGING- ROTATING MOVEMENTS INTO RECIPROCATINGMOVEMENTS Filed March 20, 1959 Fig.1.

Patented June 24, 1941 TRANSMISSION GEAR FOR CHANGING R- TATING MOVEMENTS INTO RECWROCAT- ING MOVEMENTS Gustav Kiefer, Rio de Janeiro, Brazil, assignor to Sociedade Industrial Limitada, Rio de Janeiro, Brazil Application March 20, 1939, Serial No. 262,987 In Germany October 3, 1938 1 Claim.

This invention relates to mechanical movements, and has special reference to a mechanism for elfecting translation between rotary and re ciprocatory movements.

One important object of the invention is to provide an improved mechanism for the purpose, wherein anti-friction devices are employed to effect the translation.

A second important object of the invention is to provide a novel device for the purpose wherein freely rolling balls are employed to effect the translation.

A third important object of the invention is to provide .a novel device for the purpose, wherein the speed of translation may, by proper design of the parts, be caused to vary at different parts of the movement of the driven element.

With the foregoing and other objects in View, the invention consists in the details of construction, and in the arrangement and combination of parts to be hereinafter more fully set forth and claimed.

In describing the invention on detail, reference will be had to the accompanying drawing forming part of this application, wherein like characters denote corresponding parts in the several views, and in. which- Figure 1 illustrates a vertical median section. of one form of the invention;

Figure 2 illustrates a section on the line 2-2 of Fig. 1;

Figure 3 illustrates a similar section showing a modification of the device wherein aseries of balls is employed;

Figure 4 illustrates a series of developed diagrams showing positions of the balls and grooves shown in Fig. 3;

Figure 5 illustrates a developed view of a modifled form of groove;

Figure 6 illustrates a, view showing a diagrammatic arrangement in elevation of a form of groove for guiding the balls; and

Figure 7 illustrates a plan view of the groove arrangement of Fig. 6.

In the embodiment shown in Figs. 1 and 2, there is provided an inner guide member having a shank l which is supported in a collar fixed thereon as by the set screw 2a. On the lower end of the shank l is mounted a head 3. Also, there is fixed on the lower end of the shank a cylindrical guide t having a shoulder to at its upper end and the head is held between the shoulder and the collar 2. In the guide member 4 is formed a pair of endless grooves 6, so formed as to have longitudinally displaced portions to con- 'de Ma uinas Fekima nected by spiral portions 622. Surrounding the member 4 is a sleeve 1 carried on the upper end of a reciprocatory member 8. Surrounding the sleeve 7 is an outer sleeve 9 which is fixed to the flange it of the head 3 by screws, one of which is shown at H. The sleeve 9 is provided internally with a longitudinal groove in. In the sleeve '5 are formed ball sockets la and balls 5 are held in these sockets and engage in the grooves 6 and also in the groove It. The sleeve 9 is fixed against movement. Suitable means 120. such as a pulley is used to rotate the member A.

In operation, rotation of the member t causes the balls to be moved longitudinally of the member l by the action of the grooves 6 because these balls can only move longitudinally, owing to their engagement with the fixedly positioned groove it. Consequently, the engagement of these balls 5 in the sockets la causes. reciprocatory movement of the sleeve 7 and member 8.

In Figs. 3 and 4, there are six grooves 115 in the rotary guide M corresponding to the grooves 6 in the first form. The inner sleeve H has a corresponding number of sockets We and balls and the outer sleeve is has a like number of vertical grooves 20. As shown in Fig. 4, the high points Ito and low points 161) are stepped around the member Hi.

The operation of this form is identical with that of the first form.

In the form of groove 28 shown in Fig. 5, means are provided for variable reciprocation, due to the difference in angular disposition of various parts of the groove, the portions 26a causing slower advance and retreat of the reciprocatory-element than the portions 262).

In Figs. 6 .and 7, the action of the fixed grooves as it] is modified by making such grooves in the fixed member 39 of a form other than straight as shown at 30.

There has thus been provided a simple and efficient device of the kind described and for the purpose specified. I

I claim:

In apparatus for eiiecting translation from rotary to reciprocatory motion, an outer cylindrical member having an outwardly extending flange at its upper end, said member having a plurality of rectilinear ball receiving grooves on its inner surface, a head extending over the upper end of said member and secured to the. flang thereof, said head having a centrally disposed bore, a rotatable member having a cylindrical body concentric with and of less diameter than the internal diameter of the outer member wherethe first member and said body and provided With ball receiving openings, and balls each mounted in one of said openings and each engaging one of said longitudinal grooves and a respective spiral groove.

GUSTAV KIEFER 

